I opened the macOS Digital Color Meter and set it to "native values" mode. The second-to-last OKLCH swatch has a green component of 202, and the last has a green component of 226. The corresponding values in the HSL swatches are 203 and 227.
It's visibly cyan, isn't it? It's maybe not an intuitive "green" hue (depending on your linguistic culture), but it's clearly different from all the other colors on that chart.
Basically no difference at all.